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Monday, March 31, 2014
12:30 PM - 2:00 PM
T-DO Conference Room (TA-3, Bldg 123)

Quantum Lunch

Single photon interference experiments providing new insights into wave-particle relationship

Ralf Menzel
Potsdam University, Germany

Detailed investigations of single photon interferences of separated emitters allow for analyzing the role of the mode function in quantum optics. Using two crystals for spontaneous parametric down conversion (SPDC) in a cascaded arrangement coherence can be realized across both single photon emitting crystals including an induced coherence channel. Using a three crystal setup “which-path” information of the interfering photons becomes available. It turns out that complementarity is realized via the quantum behavior of the modes . In another approach coherent higher order modes were used for SPDC. Using e.g. single-signal-photons in a TEM 01 – like mode provided interference fringes behind a Young’s double slit with high fringe visibility while the “which-slit” information seemed to be available from measuring the correlated idler photons in coincidence, simultaneously.

Host: Peter Milonni